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Just in case it might be

Just in case it might be usefull for others:

I had the same problem and first landed on this post when looking for a solution.

As mdeweerd said, the version mismatch is not an issue (It's explained on the website of RXTX, http://rxtx.qbang.org/wiki/index.php/Download "TODO: The 2.2pre2 bins contain the 2.2pre1 jar file and the 2.2pre2 native lib which causes a mismatch warning").

In my case the problem was (on a quite fresh installed Ubuntu 16.04) that I hadn't the rights to access /dev/ttyUSB0 (To test if you have the rights simply try to call "cat /dev/ttyUSB0"). If you do a "ll /dev/ttyUSB0" you will see that ttyUSB is in the group "dialout". The solution for me, was to add myself to this group: "sudo usermod -a -G dialout hereyourusername" (a restart or logout/login seems to be necessary after that).

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